【Product Description】 Hagiwara-san's Tsumiki-kun, where you can learn about numbers, shapes, and quantities. 〇 Box Size Length: 58.5cm Width: 34.5cm Height: 8cm Weight: Approximately 9kg The original retail price at the time of sale was approximately 70,000 yen. This is a well-designed toy that allows children to learn the basics of arithmetic while playing. It has the ST mark, which guarantees the safety of the toy. 【Condition】 Unused. It was opened for photography to check the condition. 【Other】 We have stock available, so if you would like to purchase multiple units, please leave a comment. 【Product Details】 The feature of "Hagiwara-san's Tsumiki-kun" is that mathematics, volume, and weight are proportional. It not only allows for the recognition of figures but also naturally cultivates the concepts of numbers, shapes, and quantities in future arithmetic, such as the basics of addition and subtraction, and the relationship between volume and weight. By cultivating a sense of mathematical reasoning from a young age, it can be connected to the foundation of arithmetic and mathematics in the future. ● About Numbers Numbers are not memorized by brain cells, but by the hands (body). In other words, numbers cannot be memorized by the eyes and brain alone, so they are learned through simulated experiences while touching them with the hands. ● About Shapes This "Hagiwara-san's Tsumiki-kun" allows for the recognition of shapes such as squares, triangles, and circles. ● About Quantity This "Hagiwara-san's Tsumiki-kun" uses beech wood with a constant specific gravity, and the numbers, volume, and weight of the building blocks are proportional. By placing them on a balance scale, the relationship between volume and weight, that is, the concept of quantity, is also naturally cultivated.